May 17 (Reuters) - Wall Street's main indexes dropped on Thursday as U.S. bond yields climbed to a seven-year high and Cisco's forecast disappointed, while looming Sino-U.S. trade talks added to the jitters.

Shares of Cisco fell 3.6 percent and were the biggest drag on all the three major indexes, after the company's forecast indicated its transition to a software-focused business was a work in progress.

Also weighing was Walmart's 1.8 percent fall. The stock was up in premarket trading after the retailer posted a rebound in its U.S. e-commerce business and beat profit estimates.

Ten-year U.S. Treasury yields hit a high of 3.1 percent as more expensive oil pointed to faster inflation and followed some upbeat U.S. retail sales numbers.

"There's a lot of chatter that the 10-year is somehow going to explode to the upside, that's why its getting everybody's attention," Kim Forrest, senior portfolio manager at Fort Pitt Capital Group in Pittsburgh.

"There is a lot of worry out there that might be reflected in the market ... and trade is the icing on the cake."

The United States and China will resume negotiations over the next two days to resolve their differences over trade, and officials from both sides have recently signaled that they are looking for a deal.

Japan is considering tariffs on U.S. exports worth $409 million in retaliation against U.S.-imposed steel and aluminum import tariffs, according to media reports.

At 9:52 a.m. EDT the Dow Jones Industrial Average was down 61.23 points, or 0.25 percent, at 24,707.70, the S&P 500 was down 2.02 points, or 0.07 percent, at 2,720.44 and the Nasdaq Composite was down 8.43 points, or 0.11 percent, at 7,389.86.

Six of the 11 main index groups were in negative territory.

Leading the gainers was the energy sector, which rose 0.9 percent after Brent crude prices hit $80 per barrel for the first time since November 2014.